Health officials issued a warning after a possible case of the mumps was reported at Evanston High School.
A letter went home describing the symptoms of the mumps virus and asked parents to make sure students are up-to-date on vaccinations.
The mumps can include a few days of fever, headache, muscle aches and swelling of the salivary glands.
It’s usually spread through coughing or sneezing.
Most children receive a mumps vaccine around their first birthday and another dose by age six.